A portal system
A. is one in which multiple arteries converge on one organ or body region.
B. is a simple circulatory system with an arteriovenous anastomosis.
C. includes a functional end artery that makes an arterial anastomosis.
D. is one in which blood flows through two capillary beds before being sent back to the heart.
E. is one in which circulation to a large organ involves only one artery and one main (portal) vein.
Answer: D
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